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用分詞的形式改寫句子

If we were given more time, we could do it much better．

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用分詞的形式改寫句子

If it is heated to a high temperature, water will change into vapor．

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用分詞的形式改寫句子

Though they had been warned of the storm, the farmers were still working in the fields．

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用分詞的形式改寫句子

When the teacher entered the classroom, he was followed by a group of his students．

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書面表達

Century School Edition Teens對幾個城市的中學生視力進行了調查,發現中學生近視眼現象嚴重,就此現象寫一篇100左右的英語短文,向該報投稿,說明保護視力的重要性及其主要措施，題目自擬。

注意：句子中要體現過去分詞的用法和至少使用一句倒裝句。

參考詞匯：nearsighted近視的　survey　n．調查